Re: Low bogomips on IBM x445 (kernel 2.6.5)

[Chris Friesen]

john stultz wrote:

> This is expected. Since the IBM x440/x445 are NUMA systems, we cannot
> use the TSC (cpu cycle counter) as a time source. Instead we use an off
> chip performance counter which runs at 100Mhz. This then translates to a
> bogoMIPS value of ~200. 

That sounds very strange.  Bogomips is supposed to be how many busy-wait loops the cpu can do in a 
second, or at least that's what I've seen in all the books.  It shouldn't matter what the time 
source is.

I would expect a NUMA machine to have different bogomips values for the different CPUs, but the 
values should still be the same as if that cpu was on a uniprocessor system, no?

Chris
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